Roll cage

Roll cages are often used in professional rally cars

Roll bar on an Esther.

Roll hoops on an Audi TT.

For the computer game, see Rollcage.Roll bar redirects here. For the suspension component called a roll bar, see sway bar.

A roll cage is a specially constructed frame built in or around the cab of a vehicle to protect the occupants from being injured in an accident, particularly in the event of a roll-over. Roll cages extend in front of the driver, next to the A-pillar, to provide as much high-speed protection as possible in a coupé. This is compared to the protection provided in open wheel racing, where a solid shell encases the majority of the driver's body as well as a rollover hoop that extends over the driver's helmet. A roll cage can also do a great deal to stiffen the chassis, which is desirable in racing applications.

A roll bar is a single bar behind the driver that provides moderate roll-over protection. A targa top is a body style that integrates an externally-visible roll bar that a semi-convertible top attaches to. Convertibles have particular concerns for roll-over protection. In most modern convertibles a strong windscreen frame acts as a roll bar.

Roll hoops are essentially two roll bars, one behind the driver and one behind the passenger. Sometimes just a single roll hoop behind the driver is used. Sometimes they are integrated into the design of the body.

The RollOver Protection System consists of two roll hoops hidden within the body of a convertible. When sensors detect an imminent rollover, the roll hoops extend and lock in place in less than 1/10th of a second. [1]